result = 0
class Calc:
#加减乘除
    def add(self,a, b):
        result = a + b
        return result

    def minus(self,a, b):
        result = a - b
        return result

    def multi(self,a, b):
        result = a * b
        return result

    def devision(self,a, b):
        result = a / b
        return result


